Symbiosis
The Giant Manta Ray represents mutualism (form of symbiosis) by visiting the cleaning stations of wrasses, angelfish, and/or remoras. This is mutualism because both creatures gain something. The ray is cleansed of the dead skin cells and parasites. The cleaning fish gains a food source from the the ray.
Competition
The Giant Manta Ray competes for the rays main prey of small fish and plankton. This is a common food source in the rays biome (coral reefs). The ray is competing with other predators for the food source.